In-situ Synthesis and Oxidation Resistance of Sialon/SiC Composite Ceramics Applied as Solar Absorber
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2021年第1期
论文作者：徐晓虹 王东斌 RAO Zhenggang WU Jianfeng ZHOU Yang
摘 要：Sialon/SiC composites were synthesized in situ from SiC,α-Si3N4,AlN,calcined bauxite,quartz and Y2O3 via layered buried sintering at different temperatures （1 540-1 640 ℃）.The results showed that the O’-sialon/SiC sample with 60 wt% silicon carbide sintered at 1 600 ℃ exhibited excellent mechanical properties,with apparent porosity of 16.01%,bulk density of 2.06 g·cm-3,bending strength of 52.63 MPa,and thermal expansion coefficient of 5.83×10-6 ℃-1.The oxide film formed on the surface was linked closely to O’-sialon,so the oxide film was not easily broken.After 100 h oxidization,the sample surface was smoother and denser,with oxidation weight gain rate 23.6 mg/cm2 and oxidation rate constant 2.0 mg2·cm-4·h-1.Therefore,the sample had the excellent high-temperature oxidation resistance.It was confirmed that the in-situ sialon/SiC composites could be a promising candidate for solar absorber owing to its high-temperature oxidation resistance.
徐晓虹1，王东斌1,2，RAO Zhenggang1，WU Jianfeng1，ZHOU Yang1
1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology2. School of Material Science and Engineering, Henan Polytechnic University
摘 要：Sialon/SiC composites were synthesized in situ from SiC,α-Si3N4,AlN,calcined bauxite,quartz and Y2O3 via layered buried sintering at different temperatures （1 540-1 640 ℃）.The results showed that the O’-sialon/SiC sample with 60 wt% silicon carbide sintered at 1 600 ℃ exhibited excellent mechanical properties,with apparent porosity of 16.01%,bulk density of 2.06 g·cm-3,bending strength of 52.63 MPa,and thermal expansion coefficient of 5.83×10-6 ℃-1.The oxide film formed on the surface was linked closely to O’-sialon,so the oxide film was not easily broken.After 100 h oxidization,the sample surface was smoother and denser,with oxidation weight gain rate 23.6 mg/cm2 and oxidation rate constant 2.0 mg2·cm-4·h-1.Therefore,the sample had the excellent high-temperature oxidation resistance.It was confirmed that the in-situ sialon/SiC composites could be a promising candidate for solar absorber owing to its high-temperature oxidation resistance.
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